Question

what is the meaning of aditive and multiplicative identity

Answer 1

ADDITIVE 
an identity element that is given in a mathematical system leaves unchanged any element which is added

MULTIPLICATIVE
an identity element that is given in a mathematical system leaves unchanged any element which is multiplied

Answer 2

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Definition of multiplicative identity. : an identity element (such as 1 in the group of rational numbers without 0) that in a given mathematical system leaves unchanged any element by which it is multiplied.
Definition of additive identity. : an identity element (such as 0 in the group of whole numbers under the operation of addition) that in a given mathematical system leaves unchanged any element to which it is added
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